Physics Force & Laws Of Motion Level: High School
. A force of magnitude P pushes the block foward and downward . Assume the force is applied at an angle of 37 degrees below the horizontal .a) Find the acceleration of the block as a function of P .
b) If P = 5.0 N find the acceleration and the friction force exerted on the block .
c) If P = 10.0 N find the acceleration and then the friction force exerted on the block .
d) Is there a definite minimum acceleration for the block ? If so , what is it ? Is there a definite maximum ?
Physics Force & Laws Of Motion Level: High School
conservation ofnmomentun
As a concerned citizen, you have volunteered to serve on a committee investigating injuries to middle school students participating in sports programs . Currently your committee is investigating the high incidence of ankle injuries on the basketball team . You are watching the team practice , looking for activities which can result in large horizontal forces on the ankle . Observing the team practice jump shots gives you an idea , so you try a small calculation . A 40- kg student jumps 1.0 meters straight up and shoots the 0.80 kg basketball at his highest point . From the trajectory of the basketball , you deduce that the ball left his hand at 30 degree from the horizontal at 20 m/s . What is the horizontal velocity when he hits the ground ?
Statistics Confidence Interval Level: High School
The probability is 1 in 4,000,000 that a single auto trip in the United States will result in fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probility of a fatal accident over a lifetime?Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of independence be violated?
(b) Why might a driver be tempted not to use a seat belt "just on this trip"?
Statistics Confidence Interval Level: High School
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that(a) both will fail?
(b)Neither will fail?
(c) One or the other will fail? Show all steps carefully
Statistics Confidence Interval Level: High School
Why is population shape of concern when estimating a mean? What does sample size have to do with it?
Statistics Confidence Interval Level: High School
State the main points of the Central Limit Theorem for a mean.
Physics Waves And Oscillations Level: High School
A small vibrating object on the surface of a ripple tank is the source of waves of frequency 20 Hz and speed 60 cm/s . The source S is moving to the right with speed 20 m/s , as shown in the figure at “click here” . At which of the labeled points will the frequency measured by a stationary observer be greatest ?1) A
2) C
3) D
4) B
5) It will be the same for all 4 points
Relative distance is decereasing between S&D
Physics Waves And Oscillations Level: High School
An ambulance is traveling North at 45.5 m/s , approaching a car that is also traveling North at 29.5 m/s . The ambulance driver hears his siren at a frequency of 971 cycles /s . The velocity of sound is 343 m/s . At what frequency does the driver of the car hear the ambulance’s siren ? Answer in units of m .
Physics Waves And Oscillations Level: High School
Doopler effect
A sound wave has a frequency of 622 Hz in air & a lamda of 0.53 m . What is the temperature of the air ? Assume the velocity of sound at 00degree C is 332 m/s . Answer in units of degree C .
Physics Waves And Oscillations Level: High School
Doopler effect
A sound wave has a frequency of 622 Hz in air & a lamda of 0.53 m . What is the temperature of the air ? Assume the velocity of sound at 00degree C is 332 m/s . Answer in units of degree C .
Physics Waves And Oscillations Level: High School
A sinusoidal wave is traveling along a rope . The oscillator that generates the wave completes 39 vibrations in 31.4 s .Also, a given maximum travels 355 cm along the rope in 8.59 s . What is the wavelength ? Answer in units of m .
Physics Waves And Oscillations Level: High School
A state trooper’s car sends out a radar signal at a frequency of 14.5 GHz . Find the wavelength of this signal . The speed of sound is 2.998 x 10^8 m/s . Answer in units of m .
Physics Waves And Oscillations Level: High School
A wave on a string is reflected from a fixed end . The reflected wave1) Has a larger amplitude than the original wave .
2) Cannot be transverse .
3) Is in phase with the original wave at the end .
4) Has a larger speed than the original wave .
5) Is 1800 degree out of phase with the original wave at the end .
Physics Waves And Oscillations Level: Middle School
A phone cord is 5.96 m long . The cord has a mass of 0.166 kg . A transverse wave pulse is produced by plucking one end of the taut cord . The pulse makes four trips down and back along the cord in 0.88 s . What is the tension in the cord ? Answer in units of N .
Physics Waves And Oscillations Level: High School
Earthquakes produce two kinds of seismic waves : The longitudinal primary waves (called S waves ) and the transverse secondary waves (called S waves ) . Both S waves and P waves travel through Earth’s crust and mantle , but at different speeds ; the P waves are always faster than the S waves , but their exact speeds depend on depth and location . For the purpose of this exercise , we assume the P wave’s speed to be vp = 8330 m/s while the S waves travel at a slower speed of vs = 4050 m/s .Suppose a seismic station detects a P wave and then delta t = 95.3 s later detects an S wave . How far away is the earthquake center ? Answer in units of km .
